Electricity and magnetism : an elementary text-book, theoretical and practical (1920)
Glazebrook, Richard, Sir, 1854-1935 · Cambridge : The University press · leaf 245
the scale is adjusted until the centre 155] MEASUREMENT OF CURRENT 235 of the mirror is vertically above the slit and halfway betweenits centre and the scale. A real image of the slit is thusformed on the scale. If the mirror be flat a convex lens is used.This is sometimes placed close to the… … Fig. 148. slit fall on the plane mirror as a parallel pencil and are re-flected as such back to the lens; after traversing it they forma real image of the slit on the scale. 236 ELECTRICITY [CH. XV If the light only traverses the lens once, it must bearranged as described in Section 96 to form a…
Electricity · Magnetism
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